Gob temperature control

Claim 1

A FOREHEARTH HAVING AN UPSTREAM END CONNECTED TO A FURNACE AND HAVING A BOWL AND DELIVERY ORIFICE AT THE DOWNSTREAM END, SAID FOREHEARTH CONSTITUTING A TROUGH HAVING THEREIN A SUBSTANTIALLY UNIFORM DEPTH OF MOLTEN GLASS FROM SAID UPSTREAMS END TO SAID BOWL, HEATING MEANS IN A FIRST ZONE UMMEDIATELY UPSTREAM OF SAID BOWL FOR SUBJECTING SAID MOLTEN GLASS IN SAID FIRST ZONE TO ABOVE SURFACE HEAT AND TO LOW LEVEL SUB-SURFACE JOULE EFFECT HEAT, HEATING MEANS IN A SECOND ZONE IN SAID FOREHEARTH IMMEDIATELY UPSTREAM OF SAID FIRST ZONE FOR CONTROLLING THE AVERAGE TEMPERATURE OF THE GLASS FLOWING TO SAID FIRST ZONE SO THAT THE AVERAGE TEMPERATURE OF THE GLASS FLOWING FROM SAID SECOND ZONE TO SAID FIRST ZONE IS SUBSTANTIALLY THE SAME AS THE TEMPERATURE OF THE GLASS ISSUING FROM SAID ORIFICE, MEANS FOR DETERMINING THE TEMPERATURE OF THE GLASS ISSUING FROM SAID ORIFICE, AND MEANS FOR ADJUSTING THE INTENSITY OF HEAT CREATED BY SAID HEATING MEANS IN SAID FIRST ZONE AND THE RATIO OF ABOVE SURFACE TO SUB-SURFACE HEAT IN SAID FIRST ZONE SO THAT GLASS PASSING THROUGH SUCH FIRST ZONE REMAINS AT SUBSTANTIALLY THE SAME AVERAGE TEMPERATURE AND SO THAT GLASS ISSUING FROM SAID ORIFICE IS OF SUBSTANTIALLY UNIFORM TEMPERATURE AS INDICATED BY SAID MEANS FOR DETERMINING TEMPERATURE.

Claim 3

A METHOD OF FEEDING GLASS FROM A FOREHEARTH HAVING AN UPSTREAM PORTION INTO WHICH GLASS IS DELIVERED FROM A FURNACE AND A DOWNSTREAM BOWL WITH ANORIFICE FROM WHICH GLASS IS WITHDRAWN, THE MOLTEN GLASS IN SAID FOREHEARTH HAVING SUBSTANTIALLY UNIFORM DEPTH FROM SAID UPSTREAM PORTION TO SAID BOWL, COMPRISING THE STEPS OF DETERMING THE TEMPERATURE OF THE GLASS ISSUING FROM THE ORIFICE, SUBJECTING THE GLASS IN A REGION IMMEDIATELY UPSTREAM OF SAID BOWL TO ABOVE SURFACE HEAT AND TO SUBSURFACE JOULE EFFECT HEAT, CONDITIONING THE GLASS IMMEDIATGELY UPSTREAM OF SAID REGION SO THAT ITS AVERAGE TEMPERATURE AS IT REACHES SAID REGION IS SUBSTANTIALLY THE SAME AS THE TEMPERATURE OF THE GLASS ISSUING FROM SID ORIFICE, AND ADJUSTING THE RATE OF SUBJECTION OF SAID ABVE SURFACE AND SUB-SURFACE HEAT AND THE RATIO OF SAID ABOVE SURFACE AND SUB-SURFACE HEAT SO THAT THE GLASS PASSING THROUGH SAID REGION REMAINS AT THE SAME AVERAGE TEMPERATURE AND THE GLASS ISSUING FROM SAID ORIFICE REMAINS AT THE SAME AVERAGE TEMPERATURE.

Claim 4

A METHOD OF FEEDING GLASS FROM A FOREHEARTH HAVING AN UPSTREAM PORTION INTO WHICH GLASS IS DELIVERED FROM A FURNACE AND A DOWNSTREAM BOWL WITH ANORIFICE FROM WHICH GLASS IS WITHDRAWN, THE MOLTEN GLASS IN SAID FOREHEARTH HAVING SUBSTANTIALLY UNIFORM DEPTH FROM SAID UPSTREAM PORTION TO SAID BOWL, COMPRISING THE STEPS OF DETERMING THE TEMPERATURE OF THE GLASS ISSUING FROM THE ORIFICE, SUBJECTING THE GLASS IN A REGION IMMEDIATELY UPSTREAM OF SAID BOWL TO ABOVE SURFACE HEAT AND TO SUBSURFACE JOULE EFFECT HEAT, CONDITIONING THE GLASS IMMEDIATGELY UPSTREAM OF SAID REGION SO THAT ITS AVERAGE TEMPERATURE AS IT REACHES SAID REGION IS SUBSTANTIALLY THE SAME AS THE TEMPERATURE OF THE GLASS ISSUING FROM SID ORIFICE, AND ADJUSTING THE RATE OF SUBJECTION OF SAID ABVE SURFACE AND SUB-SURFACE HEAT AND THE RATIO OF SAID ABOVE SURFACE AND SUB-SURFACE HEAT SO THAT THE GLASS PASSING THROUGH SAID REGION REMAINS AT THE SAME AVERAGE TEMPERATURE AND THE GLASS ISSUING FROM SAID ORIFICE REMAINS AT THE SAME AVERAGE TEMPERATURE.